You've got some really nice finds there..
You're always welcome to dig along side. When I dig I always take out a big hole, first digging to the bottom of the tip (around 1m where I was) then pushing forward filling in behind. I work on the assumption 'the more soil I shift the more finds I'll make!', it usually pays off but its hard work, I'm paying for it now!
I particularly like your brown stoppered (poison) bottles and the perfect .50 Cal bullet, your scalpel and the bone braces, Jimpy is correct in his assumption. They're in great condition, a sure sign of quality steel, I'm hoping someone can identify the ref number.
Your clamp is interesting, I'm not sure of it's scale but perhaps it was used to control the flow of fluids through tubing, maybe the wheel was to adjust the width of the hole? Sadly I have no ideas on your other items.
Finally Several cartridges have been found at the site, Whitehunter and me both found .50 cal cases this time, .30 cal have also been found, last time my 20mm Oelikon round and Tim said he'd found 20mm cases there before and of course the 37mm trench art piece. We're now thinking, following the last dig and the number of M1 carbine mags found (30 between just me and Whitehunter only keeping the best) that there must be some fired cases for these also.
All the best.